APA (7th ed.) Citation

St. Clair, O. (2003). A key to Ricardo. Routledge.

Chicago Style (17th ed.) Citation

St. Clair, Oswald. A Key to Ricardo. London: Routledge, 2003.

MLA (9th ed.) Citation

St. Clair, Oswald. A Key to Ricardo. Routledge, 2003.

Warning: These citations may not always be 100% accurate.